Diet plate



FIG. 1 is a top plan view of the diet plate with the plate being transparent glass;

FIG. 2 is a bottom plan view thereof; and,

FIG. 3 is a bottom perspective view thereof.

The broken lines in all drawing views are included for the purpose of illustrating a portion of the article that forms no part of the claimed design. 

The ornamental design for a diet plate, as shown and described. 